Materials, coefficients, notation
The following notation for material parameters is used:
characteristic compressive cylinder strength of concrete at 28 days
mean value of the modulus of elasticity of concrete at 28 days
characteristic flexural tensile strength of concrete
characteristic principal tensile strength of concrete
yield strength of reinforcing steel
The characteristic compressive strength of concrete is the basic input parameter given by the class of concrete.
The most common notation for geometrical parameters:
effective depth of cross-section
lever arm (arm of internal forces)
All computations are carried out according to the theory of limit states.